Question
Accessing environment variable inside Dockerfile - App Platform
- Posted October 22, 2021
- DigitalOcean App PlatformDocker
Hello,
I am running a website on DigitalOcean App Platform. I have couple of environment variables already configured and working fine. But What I am now trying to do is, I want to access a environment variable inside Dockerfile during build time. My use case is like below:
Dockerfile:
CP ./config/staging/conf.d /etc/nginx/conf.d
As you can see, I am trying to make the staging string into an environment variable so that I can use it on both my staging & production branches.
I tried something like this:
CP ./config/${ENVIRONMENT}/conf.d /etc/nginx/conf.d
But it didn’t work. Can someone help me?
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I figured it out.
We should define our env variable as
ARGat the beginning of the Dockerfile like this:Then we can access it later with
${ENVIRONMENT}